The clue "Use an abacus" last appeared in the The Washington Post crossword on August 28, 2018. The correct answer for this puzzle is "ADD", a 3-letter word.
Solution ADD is 3 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is ADD with 3 letters, and the shortest is ADD with 3 letters.
No, "USE AN ABACUS" hasn´t seen a spike right now. Solvers are most interested in: Apex, Plaster, Idealistic, Start and Director.
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The solution is 3 letters long.